A source tells Us Weekly that Nicole Richie, 26, teases Joel Madden, 28, about his two-and-a-half-year relationship with singer-actress Hilary Duff, 20.

“She will ask if he’s going to watch Lizzie McGuire DVDs or listen to Hilary’s albums,” says the source. “Joel tells her she’s being out of line.”

For more details on the latest celebrity feuds, check out the new issue of Us Weekly, on newsstands this week.

Source